Bag for vacuum sealing with a suction nozzle, suction nozzle and bag for vacuum sealing

ABSTRACT

A bag for vacuum sealing from which air is sucked up by a suction nozzle which is connected to a suction pipe or a suction horse of a vacuum cleaner. This bag has a small bag for air suction, and the suction nozzle is inserted in this small bag. The small bag is made of two resin films and is opened and closed by a zipper composed of a protrusion and a groove. The suction nozzle has a rear connecting portion with a check valve inside and a front portion with a suction hole, and the rear portion is to be connected to a vacuum cleaner. The rear connecting portion stands upward. The front portion is spatular and has a suction hole which opens downward. The outer circumference of the front portion where the suction hole is provided is almost equal to the inner circumference of the portion of the small bag where the suction nozzle is inserted.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a bag for vacuum sealing whichis used for vacuum packaging of bedding, voluminous clothing or thelike, a suction nozzle which is to be connected to a vacuum cleaner orthe like to suck air from the interior of the bag and a combination ofthe bag and the suction nozzle.

[0003] 2. Description of the Related Art

[0004] Various kinds of bags for vacuum sealing with resin check valvesfor containing bedding, voluminous clothing or the like have beenprovided. In the meantime, suction nozzles have been provided asattachments to the bags. Such a suction nozzle is connected to a vacuumcleaner or the like and inserted into the check valve of the bag, andwhen the vacuum cleaner is turned on, air is extracted from the interiorof the bag.

[0005] Such a conventional bag for vacuum sealing has a disadvantagethat because the check valve, which is made of resin and accordingly ishard, sticks out of the bag body, the check valve is an obstacle, andwhen a number of such bags are stacked, the check valve may cause adamage to other bags.

[0006] There is also a problem in the combination of the bag and thesuction nozzle. When the vacuum cleaner stops, air flows backward fromthe pipe or horse of the vacuum cleaner to the bag. In order to avoidthis trouble, the user tries to take the suction nozzle out of the checkvalve of the bag while operating the vacuum cleaner; at this time,however, a suction hole at the tip of of the suction nozzle comes incontact with the check valve and/or the bag and suck these up. Moreover,it is likely that the suction nozzle may come off the vacuum cleanerwhen the suction nozzle is taken out of the check valve. Further,because a gap is made between the tip of the suction nozzle and thecheck valve, air may be flow backward into the bag through this gap.

SUMMARY OF THE INVENTION

[0007] An object of the present invention is to provide a bag for vacuumsealing which is provided with a suction nozzle which securely preventsa backward flow of air into the bag.

[0008] Another object of the present invention is to provide a bag forvacuum sealing which securely prevents an air flow thereto.

[0009] Another object of the present invention is to provide a bag forvacuum sealing which is provided with a small bag for air suction whichcan be closed securely and easily.

[0010] Another object of the present invention is to provide a bag forvacuum sealing which is provided with a small bag for air suction, inwhich a connecting portion between the bag and the small bag can beformed easily.

[0011] Another object of the present invention is to provide a suctionnozzle which does not easily come off from a sucking device such as avacuum cleaner.

[0012] Another object of the present invention is to provide a suctionnozzle which securely prevents a backward flow of air.

[0013] Another object of the present invention is to provide a suctionnozzle which prevents a backward flow of air into a bag for vacuumsealing when the suction nozzle is taken out of the bag after thecompletion of a sucking operation.

[0014] Another object of the present invention is to provide a suctionnozzle which is easy to handle.

[0015] In order to attain the objects, according to a first aspect ofthe present invention, a bag for vacuum sealing provided with a suctionnozzle comprises: a bag comprising: a bag body which is made of a firstresin film with a hole in a part, and a small bag for air suction whichis made of a second resin film, which is fused with an inner surface ofthe first resin film of the bag body at the position where the hole ismade in the first resin film, which has a connecting portion forconnecting the hole to an interior of the bag body and which has azipper comprising a protrusion and a groove; and a suction nozzle whichcomprises a rear portion which is to be connected to a vacuum suckingdevice, and a front portion which has a suction hole and which can beinserted in the small bag for air suction, wherein a backward flowpreventive is provided in the suction nozzle, the backward flowpreventive permitting an air flow from the suction hole to the rearportion while preventing an air flow from the rear portion to thesuction hole.

[0016] Because the backward flow preventive provided in the suctionnozzle prevents a backward flow of air and because the small bag inwhich the suction nozzle is inserted is provided with a zipper composedof a protrusion and a groove, by closing the zipper after taking thesuction nozzle out of the small bag, an air flow into the bag can besecurely prevented.

[0017] If an indication which indicates the position and the directionwhere the suction nozzle is inserted is printed on the small bag for airsuction, the convenience will be improved.

[0018] According to a second aspect of the present invention; a bag forvacuum sealing comprises: a bag body which is made of a first resin filmwith a hole in a part; and a small bag for air suction which is made ofa second resin film, which is fused with an inner surface of the firstresin film of the bag body at the position where the hole is made in thefirst resin film, which has a connecting portion for connecting the holeto an interior of the bag body and which has a zipper comprising aprotrusion and a groove.

[0019] In the bag for vacuum sealing, because of the zipper, an air flowinto the bag after air suction can be securely prevented. The zipper ispreferably not more than 100 mm long. In this case, the zipper neverwinds, and the user can securely engage the protrusion and the groovewith each other from one end to the other end merely by pushing thecenter of the zipper.

[0020] The hole of the bag body may be made by making a slit in thefirst resin film to form a door. Making a slit is a simple process whichdoes not cause any rubbish. Also, by making a slit to form a door in thesmall bag for air suction and by fusing this door of the small bag withthe door of the bag body, it is possible to open and close these doorstogether.

[0021] The connecting portion of the small bag for air suction can beformed by carrying out a fusion preventing treatment toward the secondresin film. The small bag for air suction is fused with the first resinfilm of the bag body, and in order to prevent the connecting portion ofthe small bag from fusing with the first resin film at this time, thefusion preventing treatment is carried out on this portion.

[0022] A third aspect of the present invention provides a suction nozzlewhich is to be inserted in a small bag for air suction provided in a bagfor vacuum sealing while being connected to a vacuum sucking device soas to suck air from the bag for vacuum sealing, and the suction nozzlecomprises: a rear portion which is to be connected to a vacuum suckingdevice, and a front portion which has a suction hole and which can beinserted in the small bag for air suction, wherein a backward flowpreventive is provided in the suction nozzle, the backward flowpreventive permitting an air flow from the suction hole to the rearportion while preventing an air flow from the rear portion to thesuction hole.

[0023] In the suction nozzle, a backward flow of air can be securelyprevented by the backward flow preventive. In the suction nozzle, therear portion preferably stands upward at an angle of not less than 20degrees. For example, after the suction nozzle was used while beingconnected to a suction pipe or a suction horse of a vacuum cleaner, whena force is applied in a direction to take the suction nozzle out of thesmall bag for air suction, the nozzle take-out direction is not parallelto the direction of a force to disconnect the rear portion of thesuction nozzle from the suction pipe or the suction horse, and thesuction nozzle is not detached from the suction pipe or the suctionhorse easily.

[0024] The suction nozzle may have a flange around the circumference ofthe rear portion. When the rear portion is inserted in a horse or a pipeof a vacuum cleaner, the edge of the horse or pipe is pushed against theflange tightly, and excess air suction can be prevented.

[0025] In the suction nozzle, also, the outer circumference of the frontportion where the suction hole is made is preferably almost equal to theinner circumference of the portion of the small bag for air suction witha minimum width. In this case, when the suction nozzle is pulled out ofthe small bag after the completion of air suction, there is almost nospace between the front portion of the nozzle and the inner surface ofthe small bag, and a backward flow of air from this portion can beminimized.

[0026] Further, the front portion of the suction nozzle is preferablyspatular so that the small bag for air suction can be maintained planar.In this case, when the spatular front portion is pulled out of the bagfor vacuum sealing while being nipped between the outer resin film ofthe bag for vacuum sealing and the item contained in the bag, the smallbag can be maintained planar, and it is less likely that air flows backin the bag through the space in the resin film of the small bag.

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] These and other objects and features of the present inventionwill be apparent from the following description with reference to theaccompanying drawings, in which:

[0028]FIGS. 1a and 1 b show a first embodiment of a bag for vacuumsealing according to the present invention, FIG. 1a being a plan viewand FIG. 1b being a section view;

[0029]FIGS. 2a and 2 b show an exemplary small bag for air suction whichis provided in the bag for vacuum sealing of the first embodiment, FIG.2a being a plan view and FIG. 2b being a sectional view;

[0030]FIG. 3 is a sectional view of a zipper provided in the small bagfor air suction;

[0031]FIGS. 4a and 4 b show a second embodiment of a bag for vacuumsealing according to the present invention, FIG. 4a being a plan viewand FIG. 4b being a sectional view;

[0032]FIGS. 5a and 5 b show a second exemplary small bag for air suctionwhich is provided in the bag for vacuum sealing of the secondembodiment, FIG. 5a being a plan view and FIG. 5b being a sectionalview;

[0033]FIGS. 6a, 6 b and 6 c show a first embodiment of a suction nozzleaccording to the present invention, FIG. 6a being a front view, FIG. 6bbeing a bottom view and FIG. 6c being a side view;

[0034]FIGS. 7a, 7 b and 7 c show segments of the suction nozzle shown byFIGS. 6a, 6 b and 6 c, FIG. 7a being a front view, FIG. 7b being abottom view and FIG. 7c being a sectional view cut along the line A-A;

[0035]FIGS. 8a and 8 b show a check valve provided in the suction nozzleshown by FIGS. 6a, 6 b and 6 c, FIG. 8a being a plan view and FIG. 8bbeing a side view;

[0036]FIG. 9 is an illustration which shows the usage of the suctionnozzle shown by FIGS. 6a, 6 b and 6 c;

[0037]FIGS. 10a and 10 b show a second embodiment of a suction nozzleaccording to the present invention, FIG. 10a being a perspective viewseen from below and FIG. 10b being a perspective view seen from above;

[0038]FIGS. 11a, 11 b and 11 c show a third embodiment of a suctionnozzle according to the present invention, FIG. 11a being a plan view,FIG, 11 b being a front view and FIG. 11c being a bottom view;

[0039]FIG. 12 is a side view of the suction nozzle shown by FIGS. 11a,11 b and 11 c;

[0040]FIG. 13 is a sectional view of the suction nozzle shown by FIG.11c cut along the line G-G;

[0041]FIGS. 14a and 14 b are sectional views of segments of the suctionnozzle shown by FIGS. 11a, 11 b and 11 c;

[0042]FIGS. 15a and 15 b are front views of the segments shown by FIGS.14a and 14 b;

[0043]FIG. 16 is a sectional view of a connecting portion of the suctionnozzle shown by FIGS. 11a, 11 b and 11 c; and

[0044]FIGS. 17a and 17 b show a check valve provided in the suctionnozzle shown by FIGS. 11a, 11 b and 11 c, FIG. 17a being a plan view andFIG. 17b being a side view.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0045] Some embodiments of a bag for vacuum sealing provided with asuction nozzle, a suction nozzle and a bag for vacuum sealing will bedescribed with reference to the accompanying drawings.

First Embodiment of Bag for Vacuum Sealing and First Example of SmallBag; See FIG. 1 Through FIG. 3

[0046] First, a first embodiment of a bag for vacuum sealing isdescribed. FIG. 1 shows a bag 1A for vacuum sealing which is used tocontain bedding, clothing or the like. This bag 1A is made of a frontouter resin film 2 and a back outer resin film 3, and the bag 1A hasthree sealed sides (upper side, lower side and left side which arehatched in FIG. 1a). The right side in FIG. 1a is an opening 4, and atthis opening 4, a conventional zipper 5 composed of a protrusion and agroove is provided.

[0047] Further, a slider 8 may be provided at the opening 4 so as tofacilitate the closing of the zipper 5.

[0048] The bag 1A incorporates a small bag 10A for air suction from theinterior of the bag 1A. This small bag 10A is located on the innersurface of the resin film 2 at a portion where an hole 6 is made.

[0049] As FIGS. 2a and 2 b show, the small bag 10A is formed of tworesin films 11 and 12. In FIG. 2a, the outer resin film 2 of the bag 1Ais not shown, and in FIG. 2b, for simplification, hatching is not made.The hatched portions in FIG. 2a are fused portions.

[0050] The resin films 11 and 12 forming the small bag 10A are fusedtogether at both sides (the fused portions a and b shown by right-upwardto left-downward hatching) and also fused with the inner surface of theouter resin film 2 (at the fused portions c, d, e and f shown byleft-upward to right-downward hatching) so that air will never leak fromthe small bag 10A. A treatment for preventing the resin films 11 and 12from fusing with each other is carried out at the portion e so that aconnecting portion 13 between the exterior and the interior can beformed. The fusion preventing treatment can be realized easily byproviding a fusion preventive layer 14 on the inner surface of the resinfilm 11 (or on the inner surface of the resin film 12). The fusionpreventive layer 14 may be made of various materials. For example,photogravure of heat resist ink is preferred.

[0051] Another example of carrying out a fusion preventing treatment isto use a laminate film as the resin film 11 of the small bag 10A. Morespecifically, a laminate film which is composed of an outer film with alow fusing temperature and an inner film with a high fusing temperatureis used as the resin film 11. Then, by applying a temperature whichpermits fusion of the outer film with the portion e but does not permitfusion of the inner film with the resin film 12, the resin films 11 and12 do not fuse with each other at the portion e, whereby the connectingportion 13 can be formed.

[0052] A zipper 15 which comprises a protrusion and a groove is providedat a position which is an edge of the resin film 11 and a middle of theresin film 12. This zipper 15 is to ensure the airtightness of the bag1A. As FIG. 3 shows, the zipper 15 is a conventional type which iscomposed of bases 16, a protrusion 17 and a groove 18, the portions 16,17 and 18 being made integrally by extrusion molding. The zipper 5provided in the bag 1A is also of the same type.

[0053] As the zipper 15, various types of zippers of which protrusions17 and frooves 18 are modified in various ways, including a double type,are usable as long as they permit easy open of the hole 6 and have highsealing performance.

[0054] Further, on the surface of the resin film 12, an arrow whichshows the position and direction where a suction nozzle 20A, 20B or 20C,which will be described later, is inserted is printed.

Second Embodiment of Bag for Vacuum Sealing and Second Example of SmallBag; See FIGS. 4 and 5

[0055] A second embodiment of a bag for vacuum sealing is described. AsFIG. 4 shows, this bag 1B is basically of the same structure as the bag1A. In FIG. 4, the same parts and members are provided with the samereference numerals as in FIG. 1, and description of these parts andmembers is omitted. This bag 1B has a slit 7 a instead of the hole 6made in the outer resin film 2. Due to this slit 7 a, a small door 7 isformed, and behind the door 7, a small bag 10B for air suction from theinterior of the bag 1B is provided.

[0056] Now, referring to FIG. 5, the structure of the small bag 10B,which is a second exemplary small bag for air suction, is described. Thesmall bag 10B is formed by fusing two resin films 11 and 12 of identicaldimensions with each other at portions a, b and c, and the small bag 10Bis fused with the outer resin film 2 of the bag 1B at portions d, e, fand g so that air will not flow back into the bag 1B.

[0057]FIGS. 5a and 5 b correspond to FIGS. 2a and 2 b, respectively, inview of the method of drawing. A slit 17 a is made in the resin film 11in such a way that the slit 17 a is located inside along the slit 7 a,and thereby, a small door 17 is formed. The small door 17 and the smalldoor 7 of the bag 1B are fused together at a portion h, so that thesedoors 17 and 7 can be opened and closed together.

[0058] At the portions e and h, further, a fusion preventing treatmentis carried out, and more specifically, a fusion preventive layer 14 isprovided on the inner surface of the resin film 11 (or on the innersurface of the resin film 12) at the portions e and h so that aconnecting portion 13 between the exterior and the interior of the bag1B can be formed. Further, a zipper 15 which is of the type shown inFIG. 3 is provided on the resin films 11 and 12 so as to maintain theair tightness of the connecting portion 13.

First Embodiment of Suction Nozzle; See FIGS. 6 Through 8

[0059] Now, a first embodiment of a suction nozzle according to thepresent invention is described. FIG. 6 shows the suction nozzle 20A. Thesuction nozzle 20A has, in the rear, a connecting portion 21 with acircular section, and this connecting portion 21 is to be inserted in asuction pipe or a suction horse of a vacuum cleaner. The suction nozzle20A also has, in the front, a flat pipe with a suction hole 22 at anend. The connecting portion 21 stands upward at an angle θ ofapproximately 70 degrees.

[0060] The front end portion including the suction hole 22 is spatularand has another hole 25. This hole 25 permits the suction nozzle 20A tobe hooked when it is unused. The front end portion also has a small ballsection 26. This ball section 26 is, as will be described in detaillater, to permit the suction nozzle 20A to come across the convexportion of the zipper 15 easily when the nozzle 20A is inserted in thesmall bag 10A or 10B.

[0061] The suction nozzle 20A is made of an appropriate plasticmaterial. As FIG. 7b shows, two (right and left) segments of the suctionnozzle 20A are made separately by injection molding. Then, convexitiesand concavities formed on the joint surfaces are engaged with eachother, and the two segments are joined together.

[0062] In the connecting portion 21, a check valve 27 made of a resinfilm shown by FIGS. 8a and 8 b is fitted. The check valve 27 is placedon a valve seat 21 a shown in FIG. 7c in such a way that the hatchedportion of the check valve 27 (see FIG. 8) is bonded to the hatchedportion of the valve seat 21 a (see FIG. 7c) and that the non-bondedportion (valve flap 27 a) of the valve 27 movably rests on the valveseat 21 a. The valve flap 27 a is pivotable only in the direction ofarrow x shown in FIG. 8b, and the valve 27 permits an air flow in thedirection of arrow C shown in FIG. 7a while preventing an air flow inthe reverse direction. Further, in order to prevent the check valve 27from coming off the valve seat 21 a due to open/close motions thereof,cutouts 27 b are formed on both sides of the axis of pivot of the valveflap 27 a.

[0063] In the front end portion of the suction nozzle 20A, thecircumference of the portion with the maximum width (the portion shownby dashed line Y in FIG. 6b) is almost equal to the minimum innercircumference of the connecting portion 13 of the small bag 10A or 10B(the dimension D of the unfused portion shown in FIGS. 2a and 5 a).Also, the circumference of the pipe portion shown by the dashed line Y′in FIG. 6b is almost equal to the minimum inner circumference of theconnecting portion 13.

Usage; See FIG. 9

[0064] Now, referring to FIG. 9, a way of extracting air from theinterior of the bag 1B by use of the suction nozzle 20A is described.Further, the usage of suction nozzles 20B and 20C which will bedescribed later is basically the same as that of the suction nozzle 20A.It is to be noted that the way of using the suction nozzle 20A describedherewith is merely an example.

[0065] First, the connecting portion 21 of the suction nozzle 20A isconnected to a suction pipe or a suction horse of a vacuum cleaner. Thesmall door 7 of the bag 1B is pulled up, and simultaneously the smalldoor 17 of the small bag 10B is also pulled up. Then, the zipper 15 isopened by applying a force to separate the resin films 11 and 12 fromeach other, and thereby, a hole is formed. The front end portion of thesuction nozzle 20A is inserted in this hole, and at this time, the roundfront end of the suction nozzle 20A can come across the zipper 15smoothly.

[0066] The suction nozzle 20A is inserted further inside the bag 1Bthrough the small bag 10B, and when the vacuum cleaner is turned on, airis sucked from the interior of the bag 1B. When the vacuum cleaner isstopped after completion of the air suction, the check valve 27 providedin the suction nozzle 20A prevents air from flowing backward from thevacuum cleaner.

[0067] After the air suction, when the suction nozzle 20A is pulled outof the bag 1B, the spatular front end portion of the suction nozzle 20Aflattens the resin films 11 and 12 of the small bag 10B, and no space isformed between the resin films 11 and 12 because the resin films 11 and12 are nipped between the item contained in the bag 1B and the outerresin film 2. Also, since the circumferential surface of the front endportion of the suction nozzle 20A sticks to the inner surface of thesmall bag 10B, almost no gap is formed between the front end portion ofthe suction nozzle 20A and the small bag 10B. Thus, when the nozzle 20Ais pulled out of the small bag 10B, a backward flow of air around thecircumferential surface of the nozzle 20A can be securely prevented.

[0068] After the nozzle 20A is pulled out of the small bag 10B, the usercan engage and close the zipper 15 merely by pushing it. For easyengagement of the zipper 15, preferably, the zipper 15 is not more than100 mm long. If the zipper 15 is too long, the protrusion 17 and thegroove 18 will wind, and the user must push the zipper 15 with his/herfinger sliding from one end to the other end so as to securely engagethe protrusion 17 and the groove 18 with each other. If the zipper 15 isshort, the protrusion 17 and the groove 18 can stay straight, and theuser can engage the protrusion 17 and the groove 18 with each othermerely by pushing from above.

[0069] When the suction nozzle 20A is pulled out of the small bag 10B, aforce is applied in the direction of arrow Z shown in FIG. 6a. Thedirection of a force to disconnect the suction pipe or horse of thevacuum cleaner from the connecting portion 21 of the nozzle 20A is thedirection of arrow Z′. Therefore, with the force in the direction of Z,the connecting portion 21 will never be detached from the vacuumcleaner. If the uprising angle θ of the connecting portion 21 is notless than 20 degrees, this function can be fulfilled.

[0070] Further, the check valve 27 is located in the rear side of thebent portion of the nozzle 20A, that is, above the bent portion.Therefore, the check valve 27 stays in a position to close the nozzle 27by its own weight, and a backward flow of air can be securely prevented.

[0071] Since the suction hole 22 opens downward to suck air from below,the nozzle 20A will never suck the outer resin film 2 of the bag 1B,troubles such as degradation of sucking performance and stoppage willnever occur.

Second Embodiment of Suction Nozzle; See FIG. 10

[0072] Next, a second embodiment of a suction nozzle according to thepresent invention is described. As FIGS. 10a and 10 b show, the suctionnozzle 20B is a box type and has a plurality of suction holes 22 on itsfront end, bottom and both sides. The structure and the operation of thesuction nozzle 20B are basically the same as those of the suction nozzle20A.

[0073] The characteristics of the suction nozzle 20B are that the frontend is rounded off and that a flange 29 is provided between the box-likebody and a connecting portion 21. This flange 29 may be of a type whichcovers the whole circumference or may be composed of some sectionsseparated along the circumference.

[0074] More specifically, the rounded-off front end means that the frontend is rounded off with respect to the vertical direction as shown byarrow E in FIG. 10a and/or that the front end is rounded off withrespect to the horizontal direction as shown by arrow F in FIG. 10a. Thefunction of the rounded-off front end is, like the small ball section 26of the suction nozzle 20A, to permit the suction nozzle 20B to comeacross the zipper 15 smoothly. In the suction nozzle 20B, it ispreferred that the front end is rounded off with respect to the verticaldirection.

[0075] Even if the connecting portion 21 is inserted in a horse or apipe with an inner diameter which is larger than the outer diameter ofthe connecting portion 21, the edge of the horse or pipe is pushedagainst the flange 29, and the horse or pipe can be connected tightly tothe connecting portion 21. Therefore, excess air suction can beprevented.

Third Embodiment of Suction nozzle; See FIGS. 11 Through 17

[0076] Next, a third embodiment of a suction nozzle according to thepresent invention is described. The suction nozzle 20C basically has thesame structure and the same function as those of the suction nozzle 20A.In FIGS. 11a through 17, the same parts and members are provided withthe same reference numerals as in FIGS. 6a through 9, and repeateddescription of these parts and members is omitted.

[0077] As FIGS. 112a, 11 band 11 c show, the suction nozzle 20C has, inthe rear, a connecting portion 21 with a circular section which is to beconnected to a suction pipe or a suction horse of a vacuum cleaner. Thesuction nozzle 20C also has, in the front, a flat pipe with a mainsuction hole 22 and small suction holes 23 and 24. The front end portionincluding the main suction hole 22 is spatular.

[0078] The suction nozzle 20C is molded of an appropriate plasticmaterial. As FIGS. 14a, 14 b and 15 a, 15 b show, an upper portion and alower portion are formed separately by injection molding, and these twoportions are engaged and bonded together.

[0079] As FIG. 16 shows, in the connecting portion 21, a check valve 28is provided. As FIG. 17 shows, the check valve 28 is an integral productcomprising a semicircular fixed portion 28 a and a valve flap 28 b. Theborder 28 c between the fixed portion 28 a and the valve flap 28 b ismade thinner so that the valve flap 28 b can freely pivot on the thinnerportion 28 c.

[0080] The fixed portion 28 a is fitted in a groove 21 b formed in theconnecting portion 21, and the valve flap 28 b is movably in contactwith the inner surface of the connecting portion 21. In this state, thevalve flap 28 b permits an air flow in the direction shown by arrow Cwhile preventing an air flow in the opposite direction.

[0081] In the front end portion of the suction nozzle 20C, the outercircumference of the portion with the maximum width (shown by the dashedline Y in FIG. 11a) is almost equal to the inner circumference of theconnecting portion 13 of the small bag 10A or 10B, that is, thedimension D of the unfused portion (shown by FIGS. 2a and 5 a). Also,the circumference of the pipe body shown by the dashed line Y′ in FIG.11a is almost equal to the inner circumference of the connecting portion13.

[0082] The sucking operation of the suction nozzle 20C is basically thesame as that of the suction nozzle 20A, and in the sucking operation,the suction nozzle 20C brings the same effect as the suction nozzle 20Adoes.

Other Embodiments

[0083] The general proportion of the suction nozzle, the position(s) andthe shape(s) of the suction hole(s) and the shape of the check valve canbe arbitrarily designed. There may be provided two check valves in twolocations. The rear portion of the suction nozzle may be integrallyattached to a vacuum sucking device. The small bag for air suction maybe located in any position, and not only one small bag but also two ormore small bags for air suction may be provided in one bag.

[0084] As a preventive against a backward flow of air, instead of acheck valve, an air shield, which can be moved to an opening positionand to a closing position in response to an operation of a knob or abutton by the user, may be provided in the nozzle.

[0085] Further, the bag for vacuum sealing may be formed by any ofvarious sealing methods, and the zipper provided in the small bag forair suction may be of any type.

[0086] Although the present invention has been described in connectionwith the preferred embodiments above, it is to be noted that variouschanges and modifications are possible to those who are skilled in theart. Such changes and modifications are to be understood as being withinthe scope of the present invention.

What is claimed is:
 1. A bag for vacuum sealing provided with a suctionnozzle, comprising: a bag comprising: a bag body which is made of afirst resin film with a hole in a part; and a small bag for air suctionwhich is made of a second resin film, which is fused with an innersurface of the first resin film of the bag body at the position wherethe hole is made in the first resin film, which has a connecting portionfor connecting the hole to an interior of the bag body and which has azipper comprising a protrusion and a groove; and a suction nozzlecomprising: a rear portion which is to be connected to a vacuum suckingdevice; and a front portion which has a suction hole and which can beinserted in the small bag for air suction; wherein a backward flowpreventive is provided in the suction nozzle, the backward flowpreventive permitting an air flow from the suction hole to the rearportion while preventing an air flow from the rear portion to thesuction hole.
 2. A bag for vacuum sealing provided with a suction nozzleaccording to claim 1, wherein on the small bag for air suction, anindication which indicates a position and a direction where the suctionnozzle is inserted is printed.
 3. A bag for vacuum sealing provided witha suction nozzle according to claim 1, wherein an outer circumference ofthe front portion of the suction nozzle where the suction hole is madeis almost equal to an inner circumference of a portion with a minimumwidth of the small bag for air suction.
 4. A bag for vacuum sealingprovided with a suction nozzle according to claim 1, wherein the frontportion of the suction nozzle where the suction hole is made is spatularso as to flatten the small bag for air suction.
 5. A bag for vacuumsealing provided with a suction nozzle according to claim 1, wherein therear portion of the suction nozzle is to be connected to a vacuumcleaner.
 6. A bag for vacuum sealing, comprising: a bag body which ismade of a first resin film with a hole in a part; and a small bag forair suction which is made of a second resin film, which is fused with aninner surface of the first resin film of the bag body at the positionwhere the hole is made in the first resin film, which has a connectingportion for connecting the hole to an interior of the bag body and whichhas a zipper comprising a protrusion and a groove.
 7. A bag for vacuumsealing according to claim 6, wherein the hole of the bag body is madeby making a slit in the first resin film to form a door.
 8. A bag forvacuum sealing according to claim 7, wherein: the small bag for airsuction has a door which is formed by making a slit in the second resinfilm; and the door of the small bag is fused with the door of the bagbody.
 9. A bag for vacuum sealing according to claim 6, wherein theconnecting portion of the small bag for air suction is formed bycarrying out a fusion preventing treatment toward the second resin film.10. A suction nozzle which is to be inserted in a small bag for airsuction provided in a bag for vacuum sealing while being connected to avacuum sucking device so as to suck air from the bag for vacuum sealing,said suction nozzle comprising: a rear portion which is to be connectedto a vacuum suction device; and a front portion which has a suction holeand which can be inserted in the small bag for air suction, wherein abackward flow preventive is provided in the suction nozzle, the backwardflow preventive permitting an air flow from the suction hole to the rearportion while preventing an air flow from the rear portion to thesuction hole.
 11. A suction nozzle according to claim 10, wherein therear portion stands upward at an angle of not less than 20 degrees. 12.A suction nozzle according to claim 10, wherein a flange is provided soas to wholly cover an outer circumference of the rear portion.
 13. Asuction nozzle according to claim 10, wherein an outer circumference ofthe front portion where the suction hole is made is almost equal to aninner circumference of a portion with a minimum width of the small bagfor air suction.
 14. A suction nozzle according to claim 10, wherein thefront portion where the suction hole is made is spatular.
 15. A suctionnozzle according to claim 10, wherein the rear portion is to beconnected to a vacuum cleaner.